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Have been googling and it is just threads on issues like mine but this is my conclusion
-addition of new sockets around the flat, EICR, which I paid for separately months back and the electrician will send
-bathroom replacement. EICR and electrician Declare to local building office under part p regulations. EICR being held up, declaration has been sent.
-kitchen - ideally a minor is works certificate but not strictly necessary
I wouldn’t say you’re in a position to be firm, although not your fuck up, you’re appealing to his good will.
I’m sure a quick google will turn up what certs you need.